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ISL97675

4-Channel LED Driver with Phase Shift Control

Intersil 

Pin Configuration

ISL97675

ISL97675

(20 LD QFN)

TOP VIEW

20 19 18 17 16

VDDIO 1

EN 2

FSW/PhaseShift 3

ISET 4

NC 5

ISL97675

4mmx4mm

15 PGND

14 OVP

13 RFPWM/DirectPWM

12 FB1

11 FB2

6 7 8 9 10

Pin Descriptions (I = Input, O = Output, S = Supply)

PIN NAME

VDDIO

EN

FSW/PhaseShift

PIN NO.

1

2

3

ISET

4

NC

FB4

FB3

AGND

FB2

FB1

RFPWM/DirectPWM

5, 10

6

7

8, 9

11

12

13

OVP

14

PGND

15

SW

16

TYPE

S

I

I

I

I

I

I

S

I

I

I

I

S

O

DESCRIPTION

Decouple with capacitor for internally generated supply rail.

Enable

FSW = 0 ~ 0.25 * VDDIO, Boost Switching Frequency = 600kHz with phase shift.

FSW = 0.25 * VDDIO ~ 0.5 * VDDIO, Boost Switching Frequency = 600kHz without

phase shift.

FSW = 0.5 * VDDIO ~ 0.75 * VDDIO, Boost Switching Frequency = 1.2MHz without

phase shift.

FSW = 0.75 * VDDIO ~ VDDIO, Boost Switching Frequency = 1.2MHz with phase

shift.

Resistor connection for setting LED current, (see Equation 3 for calculating the

ILEDpeak).

No Connect.

Input 4 to current source, FB, and monitoring.

Input 3 to current source, FB, and monitoring.

Analog Ground for precision circuits.

Input 2 to current source, FB, and monitoring.

Input 1 to current source, FB, and monitoring.

External PWM dimming with frequency modulation or Direct PWM dimming without

frequency modulation.

When this pin is not biased and a resistor is connected to ground, the dimming

frequency will be set by the Setting Resistor.

When this pin is floating, the part enters Direct PWM mode such that the dimming

follows the input PWM signal without frequency modulation.

Overvoltage protection input.

Power ground (LX Power return).

Input to boost switch.

3

FN7630.0

May 19, 2010

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